Abstract

ABSTRACT The second harmonic generations (SHG) of liquid crystalline main-chain type polymers were investigated. The sample polymers are copolymers of 2-hydroxy-6-naphthoic acid (HNA) with 4-hydroxy- benzoic acid (PHB), in various composition ratios. The SHG of the film samples was greatly affected notonly by the polymerization conditions, but also by preparation conditions of the films. SHGs for thesamples processed by mechanical stretching and for electrically poled samples were compared. The nonlinear optical coefficients evaluated by Maker Fringe method of the electrically poled samples are 2-3 times larger than that of the mechaifically oriented sample whose dexp IS about 5pmIV. The high SHG of the main-chain type NLO polymers mainly originates from the additivity of hyperpolarizeability ( ) of the individual unit due to head to tail bonding.Keywords: nonlinear optics, second harmonic generation, liquid crystalline main-chain polymer,mechanically oriented sample, electrically oriented sample, Maker Fringe Method, NLOcoefficient, electro-optical properties, X-ray diagram, corona polling

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